It is hard to say what is normal -but i think in this case it isnt unusual -because there is such a huge shock involved and trying to process this often creates a state of disbelief, our brains way of potecting us for a while -carrying on as usual helps us to continue this state of disbelief stops us thinking about it at least at surface level. its what people also call displacement activity -focussing on something else even giving that activity more importance than it actually has in order to not be thinking about what has happened -funeral planning an be a displacement activity but your familly cant do that just yet so they are doing it in other ways.
Even after the funeral and for some time to come there is often a part of us that expects them to phone or walk back throught the door we know it isnt going to happen but still lie too ourselves.After losing my husband i had to move and found myself hanging his dressing gown up on the door of the new bedroom -having spun myself a little story of him working away for an unknown period of time -even while knowing full well it wasnt the case -i guess i just needed to do that to function enough to actually do the house move.
You will find different people do react differently and i think maybe when there are answers and after a funeral then although the appearance of normality may continue or not, the much longer process of grieving and all the other emotions that creates, guilt, anger, depression, anxiety will also play a much bigger role than what you are seeing now.